scholarly journals MAGNETIC FORCES AND CURRENTS OF THE INDUCTOR FOR MAGNETIC-PULSE PROCESSING OF OF WELDING JOINTS OF NON-MAGNETIC THIN SHEET METALS

2020 ◽  
Vol 2020 (5) ◽  
pp. 74-79
Author(s):  
A.P. Raschepkin ◽  
◽  
I.P. Kondratenko ◽  
O.N. Karlov ◽  
R.S. Kryshchuk ◽  
...  
Keyword(s):  
Thin Sheet ◽  
Magnetic Pulse ◽  
Sheet Metals ◽  
Magnetic Forces ◽  
Pulse Processing ◽  
Welding Joints

Effective Stripper-Holding on High Speed Precision Blanking of Electronic Machine Parts

2005 ◽  
Vol 6-8 ◽  
pp. 805-808
Author(s):  
F. Sekine
Keyword(s):  
Mechanical Model ◽  
High Speed ◽  
Thin Sheet ◽  
Dimensional Accuracy ◽  
New Method ◽  
Important Process ◽  
Sheet Metals ◽  
Progressive Dies ◽  
Machine Parts

The blanking of thin sheet metals using progressive dies is an important process on production of precision electronic machine parts. As a model of IC leadframe, an I-shaped and an Lshaped models were blanked and influences of blanking conditions on dimensional accuracy of blanked lead were examined. Furthermore, a mechanical model is proposed to explain the affect of the blanking conditions on product accuracy. In these days, more fine leads are required as electronic machines become more precise and accurate. It must be treated that leads are firmly held for blanking leadframes accurately. In this paper, an effective method of stripper holding leads strongly are discussed and a new method using newly designed stripper is proposed. Consequently the effect of it on lead accuracy is proved.

Characterization of Tensile and Compressive Behavior of Microscale Sheet Metals Using a Transparent Micro-Wedge Device

2011 ◽  
Author(s):  
James Magargee ◽  
Jian Cao ◽  
Rui Zhou ◽  
Morgan McHugh ◽  
Damon Brink ◽  
...  
Keyword(s):  
Mechanical Behavior ◽  
Thin Sheet ◽  
Thin Sheets ◽  
Stainless Steel Sheet ◽  
Sheet Metals ◽  
Compressive Behavior ◽  
Buckling Modes ◽  
Full Field ◽  
Compressive Loads

The cyclic and compressive mechanical behavior of ultra-thin sheet metals was experimentally investigated. A novel transparent wedge device was designed and fabricated to prevent the buckling of thin sheets under compressive loads, while also allowing full field strain measurements of the specimen using digital imaging methods. Thin brass and stainless steel sheet metal specimens were tested using the micro-wedge device. Experimental results show that the device can be used to delay the onset of early buckling modes of a thin sheet under compression, which is critical in examining the compressive and cyclic mechanical behavior of sheet metals.

The efficiency of backward magnetic-pulse processing

2017 ◽  
Vol 43 (1) ◽  
pp. 92-94 ◽  
Author(s):  
Yu. B. Kudasov ◽  
D. A. Maslov ◽  
O. M. Surdin
Keyword(s):  
Magnetic Pulse ◽  
Pulse Processing

scholarly journals Friction and Lubrication in the Cold Rolling of Thin Sheet Metals

1969 ◽  
Vol 12 (50) ◽  
pp. 359-367 ◽  
Author(s):  
Takaji MIZUNO ◽  
Kiyoshi MATSUBARA ◽  
Hiroshi KIMURA
Keyword(s):  
Cold Rolling ◽  
Thin Sheet ◽  
Sheet Metals ◽  
Friction And Lubrication

scholarly journals Magnetic-pulse processing of seeds of berry crops 

2018 ◽  
Vol 64 (No. 4) ◽  
pp. 181-186 ◽  
Author(s):  
Andrey Izmailov ◽  
Igor Smirnov ◽  
Dmitriy Khort ◽  
Rostislav Filippov ◽  
Alexey Kutyrev
Keyword(s):  
Magnetic Field ◽  
Control Sample ◽  
Low Frequency ◽  
Magnetic Pulse ◽  
Pulse Processing ◽  
Berry Crops ◽  
Frequency Magnetic Field ◽  
Irradiation Frequency ◽  
Pulsed Electromagnetic ◽  
Maximum Increment

The effect of a pulsed low-frequency magnetic field on the seed germination and the growth of seedlings of strawberry garden under different conditions of processing and functioning of the apparatus magnetic-pulse processing of plants (MPP) developed by us has been established experimentally. The research has shown that the value of the germination energy of seeds treated with a pulsed magnetic field varied from 29 to 47 percent, of germination from 34 to 48 percent. The highest value of their germination corresponds to an irradiation frequency of 16 Hz and an exposure time of 360 seconds with an induction value in the treatment zone of 5 mT. The maximum increment in the germination of irradiated seeds was 14 percent compared to the control sample. The positive effect of pulsed electromagnetic fields on linear dimensions of germs has been revealed. The increase in the biometric parameters of strawberry shoots affected their weight, compared to the control it increased by 33.3 percent.

scholarly journals Tensile properties of thin-sheet metals after cyclic damage

2011 ◽  
Vol 10 ◽  
pp. 1961-1966 ◽  
Author(s):  
J. Galán López ◽  
P. Verleysen ◽  
I. De Baere ◽  
J. Degrieck
Keyword(s):  
Tensile Properties ◽  
Thin Sheet ◽  
Sheet Metals ◽  
Cyclic Damage

Experimental Investigation on Solid State Resistance Spot Welding

2017 ◽  
Author(s):  
Zhijun Wu ◽  
Guanlin Zhang ◽  
Bingxu Wang ◽  
Kelvin Shih
Keyword(s):  
Solid State ◽  
Resistance Spot Welding ◽  
Spot Welding ◽  
Mechanical Performance ◽  
Thin Sheet ◽  
Welding Current ◽  
Sheet Metals ◽  
Resistance Spot ◽  
Nugget Formation ◽  
State Resistance

Resistance Spot Welding (RSW) is one of the most common and dominant technologies utilized in the automotive industry to join the thin sheet metals together, and expulsion is a common phenomenon during the operation. How to ensure the high quality nugget formation and joining performance is essential to ensure the quality and integrity of structures. In this study, solid state resistance spot welding is introduced in order to prevent expulsion. The effect of welding current and welding time on the mechanical performance of the solid state RSW in terms of nugget size, tensile performance and nugget formation will be investigated experimentally by using steel sheet metals. Microstructure and micro-hardness of the nugget cross-section will be evaluated as well.

Non-Thermal Laser Stretch-Forming

2005 ◽  
Vol 6-8 ◽  
pp. 433-440 ◽  
Author(s):  
H. Schulze Niehoff ◽  
Frank Vollertsen
Keyword(s):  
Power Density ◽  
New Technology ◽  
Thin Sheet ◽  
Laser Pulses ◽  
Dome Height ◽  
Co2 Lasers ◽  
Sheet Metals ◽  
Stretch Forming ◽  
Process Technology ◽  
New Process

A new process technology for stretch-forming of thin sheet metals is presented within this paper. This new technology is based on shock waves as a source for the forming energy, which are created through laser pulses. The results of some preliminary experiments show, that stretchforming with laser pulses is possible. The influence of parameters like defocussing, power density, pulse energy, number of pulses and material are worked out with excimer-laser pulses. The results show, that uniform shaped domes with a dome height over 250 µm with diameters of 1.4 mm could be produced. More recent studies show that even better results can be reached through the use of TEA-CO2-Lasers, since no confinement is needed and ablation at the surface is avoided. The absence of ablation at the surface makes this new technology even more interesting, since not only the surface remains accurate, but also since several pulses can be applied at one point and thus higher forming degrees can be reached without increasing the power density.

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